mPEG12-N3 | CAS 2170098-29-8

mPEG12-N3 is a methoxy-terminated polyethylene glycol (mPEG) azide functional reagent designed for copper-free and/or copper-mediated azide–alkyne click chemistry workflows. As an azide-bearing PEG conjugation handle, it provides a highly hydrophilic, sterically flexible spacer that improves solubility and reduces nonspecific interactions in bioconjugation and materials contexts. The mPEG chain length and terminal azide make mPEG12-N3 a common building block for installing PEG “stealth” layers, tuning surface properties, and generating modular PEG conjugates for downstream probe, polymer, and surface functionalization.

1. PEGylated Probe Conjugation

mPEG12-N3 is widely used to prepare PEGylated labeling reagents and imaging probes where improved aqueous solubility and reduced aggregation are essential. Researchers incorporate the terminal azide as a clickable PEG spacer to connect fluorescent dyes, affinity tags, or other reporter motifs to biomolecular targets through azide–alkyne coupling. In molecular imaging and chemical biology workflows, the PEG segment helps maintain probe dispersion in complex buffer systems and supports multicomponent labeling strategies where controlled spacing between functional groups can influence binding and signal stability.

2. Surface Functionalization for Biomaterials

mPEG12-N3 supports PEG brush and antifouling surface modification for biomaterials, biosensor interfaces, and assay platforms that require stable hydrophilic coatings. The azide terminus enables click-based attachment to alkyne-functionalized substrates, allowing straightforward installation of PEG layers onto polymer films, hydrogel networks, and patterned surfaces. This application is particularly common in diagnostic reagent development and lab-on-chip prototyping, where nonspecific adsorption and surface-induced variability can compromise assay reproducibility.

3. Polymer and Nanoparticle PEG Tuning

mPEG12-N3 is used as a PEG tuning component in polymer synthesis and nanoparticle formulation to adjust colloidal stability, steric stabilization, and interfacial behavior. By clicking the azide-functional PEG onto alkyne-bearing polymer backbones or nanoparticle ligands, developers can systematically vary surface hydration and improve dispersion in formulation-relevant media. Such PEG-modified constructs are frequently used as platforms for modular conjugation, enabling subsequent attachment of targeting ligands or functional handles while maintaining robust processability for research-scale materials production.

4. Multivalent Bioconjugation Handles

mPEG12-N3 serves as a modular PEG–azide linker for multivalent bioconjugation schemes where a flexible, hydrophilic spacer is needed between a biomolecule and a functional payload. Chemical biology teams often use it to create clickable PEG linkers that can be appended to antibodies, peptides, proteins, or nucleic-acid-associated constructs via azide–alkyne chemistry. The resulting conjugates are valuable tools for building libraries of structurally defined derivatives, supporting studies that require consistent spacing, reduced nonspecific binding, and improved handling of conjugated biomolecules in aqueous assay buffers.